/
promql-langserver.go
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/
promql-langserver.go
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// Copyright 2019 Tobias Guggenmos
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"context"
"flag"
"fmt"
"log"
"net/http"
"os"
kitlog "github.com/go-kit/kit/log"
promClient "github.com/prometheus-community/promql-langserver/prometheus"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus-community/promql-langserver/langserver"
"github.com/prometheus-community/promql-langserver/rest"
)
func main() {
configFilePath := flag.String("config-file", "", "Configuration file for the language server. If unset, the configuration will be retrieved from environment")
flag.Parse()
config, err := langserver.ReadConfig(*configFilePath)
if err != nil {
fmt.Fprintln(os.Stderr, "Error reading config file:", err.Error())
os.Exit(1)
}
if config.RESTAPIPort != 0 {
fmt.Fprintln(os.Stderr, "REST API: Listening on port ", config.RESTAPIPort)
prometheusClient, err := promClient.NewClient(config.PrometheusURL)
if err != nil {
log.Fatal(err)
}
var logger kitlog.Logger
switch config.LogFormat {
case langserver.JSONFormat:
logger = kitlog.NewJSONLogger(os.Stderr)
case langserver.TextFormat:
logger = kitlog.NewLogfmtLogger(os.Stderr)
default:
log.Fatalf(`invalid log format: "%s"`, config.LogFormat)
}
logger = kitlog.NewSyncLogger(logger)
handler, err := rest.CreateInstHandler(context.Background(), prometheusClient, prometheus.NewRegistry(), logger)
if err != nil {
log.Fatal(err)
}
err = http.ListenAndServe(fmt.Sprint(":", config.RESTAPIPort), handler)
if err != nil {
log.Fatal(err)
}
} else {
_, s := langserver.StdioServer(context.Background(), config)
if err := s.Run(); err != nil {
log.Fatal(err)
}
}
}